JAJSD08D October 2015 – November 2022 DP83867CS , DP83867E , DP83867IS
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In some multiport applications, RJ-45 ports may be mirrored relative to one another. This mirroring can require crossing board traces. The DP83867 can resolve this issue by implementing mirroring of the ports inside the device.
In 10/100 operation, the mapping of the port mirroring is:
MDI MODE | MIRROR PORT CONFIGURATION |
---|---|
MDI | A → D |
B → C | |
MDIX | A → D |
B → C |
In Gigabit operation, the mapping of the port mirroring is:
MDI MODE | MIRROR PORT CONFIGURATION |
---|---|
MDI or MDIX | A → D |
B → C | |
C → B | |
D → A |
Mirror mode can be enabled through strap or through register configuration using the Port Mirror Enable bit in the CFG4 register (address 0x0031). In Mirror mode, the polarity of the signals is also reversed.